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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]          
Current $ 0 $ 0 $ 439 $ 0  
Deferred (684) (437) 1,826 3,047  
Total income tax (expense) benefit (684) $ (437) 2,265 $ 3,047  
Net deferred tax assets $ 30,834   $ 30,834   $ 29,006